I have 3 ereaders: the Sony, the Iliad Rex (second version) and a Nokia N800 (using FBReader). For some reason, I find my eyes get tired quickly reading the Sony, even though I use a large font. When I use the Iliad, I don't have that problem -- using about the same size font and making pdf's with Book Designer. I think a larger screen is easier on the eyes -- even though the contrast of the Iliad is a bit less than the Sony. Of course the Iliad has some deficiencies -- short battery life, a rather tortured process to get a good pdf, awkward charging system. But for me, the ease of reading makes it superior. The Nokia, which is backlit, seems reasonably easy on the eyes, though not as good as the Iliad. I haven't seen the small screen size of the Sony/Kindle/Bebook etc. addressed as a deficiency in this forum, but for me it's a major shortcoming. I'd also note that the Iliad, with its much bigger screen, doesn't weigh much more than the Sony and is quite comfortable to read in bed (though, sadly, Irex doesn't make any kind of light for it).

Any reader with an 800x600 screen should give you trouble reading larger pdf files, which is less an issue on the higher screenresolution of the Iliad.
Most people have no complains as far as reading ebooks on their ebook reader devices.
Sure some lines get wrong intended, or maybe the last word of one line just happen to not fit on the line and written in the next line where it stands alone.

I'm more in favor of the HD standard. From 1024x720, 1366x768 to 1280x800 10 to 11" readers in my eyes can be perfect book replacements, and display most pdf's without problems.
Plastic logics is creating a device like that, which I hope they will price it reasonably.
In any case,the longer they wait, the lower their salesprice will be.
I'm expecting to buy plastic logics reader in 1,5 years for less than $350-450 (depending on the strength of the dollar).

Iliad,plastic logics reader...
anything larger than 720p.; doesn't matter if it exsists or not.
On a pc I spend some time trying to figure things out,and the additional 120pixels (600 to 720) seems to be enough to read most pdf's written in A4 size.

Sorry, let me re-phrase the question. I know that "HD" stands for "high definition". What I meant what, what is the "HD Standard" as it applies to eBook reading devices?

I think he simply means that he wants to see an ebook reader with a resolution of 1024x720 pixels. I know I'd like to see such a reader, especially if they will keep the current size (6in), and increase the contrast. Will be much easier to read small fonts.